To investigate the performance characteristics of these fins, 9 single row finned tube heat exchangers sample were tested in a suction opened circuit thermal wind tunnel for a number of geometers.

为了考察这类翅片的性能特征，对9种不同几何参数的单排肋管式换热器样件在吸风式直流热风洞内进行了实验。

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Besides, they decrease rapidly with the increase of tube bundle rows. When the row number amount to 8 or more, the resistance coefficient does not change any more.

随管束排数的增加，阻力系数迅速下降，当管束排数大于8后，则不再有明显变化。

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Besides, they decrease rapidly with the increase of tube bundle rows. When the row number amount to 8 or more, the resistance coefficient does not change any more.

随管束排数的增加，阻力系数迅速下降，当管束排数大于8后，则不再有明显变化。

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